16mm. 6mm thickness. Semi-precious Charoite gemstone beads, cut in twisted squares and then drilled on the diagonal. WOW, these gemstone beads make quite a statement! Semi-precious Charoite is an unusual mineral of rare occurrence that is only found in the Chara River area of Siberia. It has shades of violet and deep purple with veins of black, gray, and white. It is said that putting Charoite gem stones under your pillow at night will chase away the fears that appear in your dreams.